Green’s Dictionary of Slang

(US black/drugs) crack cocaine .

1995		Gangsta Pat ‘OJ Murder Story’ 🎵 How you get this krill, bitch.
2002		Talib Kweli ‘Shock Body’ 🎵 Or filling the pipe with the krill.
2010		Vinnie Paz ‘Righteous Kill’ 🎵 Drink 40s, smoke l’s, push the white and krill.
2022		A. Kirzman quoting NYT 28/07/2000 in Giuliani 108: [Detective] Moran approached Dorismond [...] pretending to be a buyer. ‘Have any krills?’ he asked, using street language for crack.